20973455 has 8 divisors (see below), whose sum is σ = 25202112. Its totient is φ = 16756128.

The previous prime is 20973451. The next prime is 20973457. The reversal of 20973455 is 55437902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20973455 - 2² = 20973451 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20973451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1994 + ... + 6776.

It is an arithmetic number, because the mean of its divisors is an integer number (3150264).

Almost surely, 2^20973455 is an apocalyptic number.

20973455 is a deficient number, since it is larger than the sum of its proper divisors (4228657).

20973455 is an equidigital number, since it uses as much as digits as its factorization.

20973455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5665.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 20973455 is about 4579.6784821644. The cubic root of 20973455 is about 275.7761215719.

The spelling of 20973455 in words is "twenty million, nine hundred seventy-three thousand, four hundred fifty-five".